package com.yj.suncity.utis;


import android.annotation.SuppressLint;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.PorterDuff.Mode;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.widget.ImageView;

public class CircleImageView extends ImageView {

    // 控件默认长、宽  
    private int defaultWidth = 0;  
    private int defaultHeight = 0; 

	public CircleImageView(Context context) {
		this(context, null);
	}

	public CircleImageView(Context context, AttributeSet attrs) {
		this(context, attrs, 0);
	}

	public CircleImageView(Context context, AttributeSet attrs, int defStyle) {
		super(context, attrs, defStyle);
    }

	/**
	 * 绘制圆形图片
	 * 
	 * @author danghuihui
	 */
	@SuppressLint("DrawAllocation")
	@Override
	protected void onDraw(Canvas canvas) {

		Drawable drawable = getDrawable();
		if (null != drawable) {
			Bitmap b = ((BitmapDrawable) drawable).getBitmap();
	        Bitmap bitmap = b.copy(Bitmap.Config.ARGB_8888, true);  
	        if (defaultWidth == 0) {  
	            defaultWidth = getWidth();  
	  
	        }  
	        if (defaultHeight == 0) {  
	            defaultHeight = getHeight();  
	        } 
		   int  radius = (defaultWidth < defaultHeight ? defaultWidth  
	                    : defaultHeight) / 2;  
	      
	        Bitmap roundBitmap = getCroppedRoundBitmap(bitmap, radius);  
	        canvas.drawBitmap(roundBitmap, defaultWidth / 2 - radius, defaultHeight  
	                / 2 - radius, null);

		} else {
			super.onDraw(canvas);
		}
	}

	public Bitmap getCroppedRoundBitmap(Bitmap bmp, int radius) {
		Bitmap scaledSrcBmp;
		int diameter = radius * 2;

		// 为了防止宽高不相等，造成圆形图片变形，因此截取长方形中处于中间位置最大的正方形图片
		int bmpWidth = bmp.getWidth();
		int bmpHeight = bmp.getHeight();
		int squareWidth = 0, squareHeight = 0;
		int x = 0, y = 0;
		Bitmap squareBitmap;
		if (bmpHeight > bmpWidth) {// 高大于宽
			squareWidth = squareHeight = bmpWidth;
			x = 0;
			y = (bmpHeight - bmpWidth) / 2;
			// 截取正方形图片
			squareBitmap = Bitmap.createBitmap(bmp, x, y, squareWidth,
					squareHeight);
		} else if (bmpHeight < bmpWidth) {// 宽大于高
			squareWidth = squareHeight = bmpHeight;
			x = (bmpWidth - bmpHeight) / 2;
			y = 0;
			squareBitmap = Bitmap.createBitmap(bmp, x, y, squareWidth,
					squareHeight);
		} else {
			squareBitmap = bmp;
		}

		if (squareBitmap.getWidth() != diameter
				|| squareBitmap.getHeight() != diameter) {
			scaledSrcBmp = Bitmap.createScaledBitmap(squareBitmap, diameter,
					diameter, true);

		} else {
			scaledSrcBmp = squareBitmap;
		}
		Bitmap output = Bitmap.createBitmap(scaledSrcBmp.getWidth(),
				scaledSrcBmp.getHeight(), Config.ARGB_8888);
		Canvas canvas = new Canvas(output);

		Paint paint = new Paint();
		Rect rect = new Rect(0, 0, scaledSrcBmp.getWidth(),
				scaledSrcBmp.getHeight());

		paint.setAntiAlias(true);
		paint.setFilterBitmap(true);
		paint.setDither(true);
		canvas.drawARGB(0, 0, 0, 0);
		canvas.drawCircle(scaledSrcBmp.getWidth() / 2,
				scaledSrcBmp.getHeight() / 2, scaledSrcBmp.getWidth() / 2,
				paint);
		paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
		canvas.drawBitmap(scaledSrcBmp, rect, rect, paint);
		// bitmap回收(recycle导致在布局文件XML看不到效果)
//		 bmp.recycle();
//		 squareBitmap.recycle();
//		 scaledSrcBmp.recycle();
		bmp = null;
		squareBitmap = null;
		scaledSrcBmp = null;
		return output;
	}

}